Inspection and Maintenance

This equipment contains components manufactured with various materials. Some cleaning agents could damage the integrity of the surface of the component reducing its insulating properties, structural strength or conductivity. Use this guide to determine a compatible cleaning agent for typical materials incorporated in this equipment. Never spray cleaners or use compressed air on or inside the equipment as this will cause the contamination or cleaners to become airborne and could contaminate other components.

• Greased joints:

  • Wipe surface grease away with a clean cloth. Reapply the grease recommended for that assembly, found in the maintenance section of the documentation for that assembly.

• Glass polyester insulator surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Use distilled or purified water to moisten the cloth in place of denatured alcohol, but standing/pooling water must be absorbed and not left to air dry.

  • Use care so the liquid does not flow between bus joints.

• Epoxy insulator surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Use distilled or purified water to moisten the cloth in place of denatured alcohol, but standing/pooling water must be absorbed and not left to air dry.

  • Remove residue by lightly rubbing with a dry Scotch-Brite non-scratch scour pad followed by wiping with a clean cloth moistened with denatured alcohol, distilled or purified water.

  • Use care so the liquid does not flow between bus joints or between the epoxy coating and bus.

• Ceramic/porcelain insulator surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Use distilled or purified water to moisten the cloth in place of denatured alcohol, but standing/pooling water must be absorbed and not left to air dry.

  • Use care so the liquid does not flow between bus joints or between the epoxy coating and bus.

  • Remove residue by lightly rubbing with a multi-functional HV insulator cleaning paste on a clean cloth followed by wiping with a clean cloth moistened with denatured alcohol, or distilled or purified water.

• Poly concrete standoff insulator surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Use care so the liquid does not flow between bus joints.

• Plastisol boot surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Use distilled or purified water to moisten the cloth in place of denatured alcohol, but standing/pooling water must be absorbed and not left to air dry.

  • Use care so the liquid does not flow inside the boot and between the bus joints.

• Polycarbonate/Lexan surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Use distilled or purified water to moisten the cloth in place of denatured alcohol, but standing/pooling water must be absorbed and not left to air dry.

  • Do not wipe in a circular motion, use linear strokes directed toward an exposed edge.

  • Change the water and rinse the cloth often.

  • Dry with a clean cloth.

  • Use denatured alcohol dampened on a clean cloth on the polycarbonate/Lexan insulation barriers as there is no UV protection applied to the sheet that would cause degradation.

• Silver/tin plated copper surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Remove residue by lightly rubbing with a dry Scotch-Brite non-scratch scour pad followed by wiping with a clean cloth moistened with denatured alcohol.

  • Use care so the liquid does not flow between bus joints.

• Powder coated surfaces:

  • Wipe with a clean cloth dampened with denatured alcohol.

  • Use distilled or purified water to moisten the cloth in place of denatured alcohol, but standing/pooling water must be absorbed and not left to air dry.

  • Remove residue by lightly rubbing with a dry Scotch-Brite non-scratch scour pad followed by wiping with a clean cloth moistened with denatured alcohol, or distilled or purified water.

  • Use care so the liquid does not splash or flow into seams or onto other components.

• Control component surfaces:

  • Low voltage wires within this equipment are SIS insulated and may be wiped with a clean cloth dampened with distilled or purified water. Do not use alcohol.

  • Circuit boards can have isopropyl alcohol applied by small brush to remove deposits.

  • Solvents and alcohol (denatured, isopropyl) can damage some plastics, such as amorphous plastics. When in doubt, use a clean dry cloth, or a clean cloth dampened with distilled or purified water and dry completely.

• NOTES:

  • Do not use cleaners such as Lectra-Clean™ made by CRC (noted in some of the low voltage equipment manuals). Lectra-Clean can damage some plastics and other components.

  • Do not use chemicals such as Simple Green™ as it can cause corrosion on some parts and in some cases those cleaners describe rinsing the surface after application.

  • Do not splash or spray liquids as they can infiltrate areas that cannot be cleaned or dried properly.

  • Components within the equipment are not rated to be exposed to moisture. Exposure to moisture may cause performance issues to develop over the life of the product.

1. Turn off all main and control power supplying this equipment. Be sure there is no backfeed through any feeder circuit. Always use a properly rated voltage sensing device to confirm that power is off.

2. Ground the main and feeder circuits.

3. Disconnect and remove fuses.

4. Disconnect and remove the circuit breaker.

5. Remove the covers from each main bus compartment. Inspect the busbars, primary contact supports, and insulating barrier(s) for damage.

   NOTE: Slight discolorations or tarnish of the silver plate is normal. Severe discoloration of the silver plate is an indication of an improper or loose contact and overheating. Clean the discoloration from the contact surfaces of the bus bar and primary contact as instructed above. For questions concerning cleaning, repairing, or replacing bus bars contact your local Schneider Electric representative

6. Remove the insulating boots from the bus joints. Check all bus bar connections, and torque all 0.5 inch (13 mm) bolts to 55 lb-ft. (74.28 N•m). When replacing boots, utilize all locations on the boot to close the boot.

7. Vacuum each compartment to remove dust, spiderwebs, or other dirt. Clean the insulation as instructed above.

8. Lightly lubricate the moving primary and secondary contacts and fingers with red Mobilgrease® 28 (Schneider Electric part number 1615100950).

9. Lightly lubricate the following parts with red Mobilgrease 28 (Schneider Electric part number 1615-100950):

   • Rollers and sliding parts

   • Racking arm and shaft

   • Shutter actuator

1. Inspect the load connectors, stand-off insulators, primary contact supports, and all accessible cable terminations for indications of insulation deterioration.

2. Vacuum each compartment and clean all insulation as instructed above.

3. Replace removable back covers.

1. Withdraw each circuit breaker from its compartment, and thoroughly inspect each of the moving mechanisms in the compartment for damage and contamination/pollution.

2. Inspect the shutter hardware and tighten if necessary. The shutters should raise and lower smoothly with no indication of binding, twisting, or hesitation.

3. Inspect the primary contacts. They should have a silver-gray appearance, indicating good contact with the circuit breaker separable contacts. Slight discoloration or tarnish of the silver plate on the primary contact is normal. Severe discoloration of the silver plate is an indication of excessive heating and should be corrected. Typical causes are:

   • Poor contact between the circuit breaker finger cluster and the primary contacts.

   • Loose hardware or otherwise improper contact at the bus connection.

4. Clean the discoloration and tighten the contact mounting bolts to the proper torque. See Bolt Torque Values.

5. Inspect the primary contact and support insulators for damage.

6. Inspect the ground contact bar. It should have marks indicating good contact with the circuit breaker sliding contacts. Clean the contact surfaces, removing grease and dirt buildup. Inspect and tighten the hardware and re-grease with Mobil 28 grease, Schneider Electric part number 1615-100950, as instructed above.

7. Inspect the stationary control power receptacle, ensuring that the molding is free of cracks, the socket contacts are clean, and the assembly is free to move. Clean the front and back surfaces of the receptacle to remove any contamination buildup as instructed above.

8. Vacuum the compartment, and wipe off the primary contact high voltage insulating tubes and support insulation as instructed above.

9. Every 50 cycles of the racking mechanism:

   • Lightly lubricate the moving primary and secondary contacts and fingers with Mobil 28 grease, Schneider Electric part number 1615-100950.

   • Lubricate all moving joints (shutters, MOC, TOC, and so forth) with Mobil 28 grease, Schneider Electric part number 1615100950.

10. Check all terminal block connections for loose connections and crimps.

11. Make certain that the hinge wiring to the door is not frayed and has no insulation damage.

12. Ensure all wires are routed through the hinge loop.

Consult the individual circuit breaker instruction and maintenance manual for cleaning, adjustment, and lubrication information.

Refer to the Type VR Circuit Breaker instruction bulletins 6055-31 (1200 and 2000 A, 50 kA) and 6055-33 (3000 A, 50 kA and 1200, 2000, and 3000 A, 63 kA).

1. Pull the drawer to the fully withdrawn position.

2. Inspect the moving and stationary primary and secondary contacts and the static ground contacts.

3. Clean the contact surfaces, removing any burn or pit marks if required. Use an abrasive pad such as 3M ScotchBrite.

4. Remove the current limiting fuses, and inspect the fuse clip and fuse contact surfaces.

5. Inspect the transformer for indication of insulation deterioration.

6. Check all hardware, including the secondary contact wiring terminals, for tightness. Refer to torque values in Bolt Torque Values.

7. Vacuum the compartment and drawer.

8. Wipe off the insulation and control power transformer with a clean, dry cloth.

9. Lightly lubricate the moving primary and secondary contacts and fingers with Mobil 28 grease, Schneider Electric part number 1615-100950.

10. Lubricate all rollers and sliding parts with Mobil 28 grease, Schneider Electric part number 1615-100950.

11. Inspect the interlock mechanism for proper operation.

12. Replace the current limiting fuses, but leave the drawer in the withdrawn position until all the inspection and maintenance is completed.

To replace damaged fuses in the voltage transformer drawout unit:

1. Follow the procedures outlined in Voltage Transformer, Control Power Transformer, and Fuse Drawout Units to withdraw the appropriate fuse drawout unit.

2. Wearing personal protective equipment, such as insulated gloves and a face shield, grasp the fuse near the fuse clip and pull while rotating the fuse.

3. Insert the fuses one end at a time into the fuse clips.

4. Follow the racking procedures outlined in Voltage Transformer, Control Power Transformer, and Fuse Drawout Units to return the unit to the CONNECTED position.

1. Insert all of the circuit breakers to the test/disconnected position with their secondary control power plugs engaged, and close the compartment doors.

2. Connect the control power source.

3. Close the main source of power, and operate each circuit breaker electrically in the test/disconnected position.

4. If all controls are functioning properly, disconnect the secondary control plugs.

5. Rack the circuit breakers into the connected position.

6. Close the circuit breakers and resume normal operation.